Javascript URL validation regex

Question

I had the following url validation regex:

/(ftp|https?)://[^ "]+$/

This is from the ref: Regular expression for URL validation (in JavaScript)

This works fine including cases like http://localhost:8080, but it also validates the below ones that i dont want. The above regex should not pass the below urls

 1. http://www.example..com
 2. http://.com
 3. http://.
 4. http://www.example.

Kindly help as am a noob in regex

Second question, though not related to the question but regex is, when i validate null and undefined against the regex /^[a-z]+$/i i get true. Is this the default behavior or am i missing something over here?

what do you mean by fail? are they marked as valid or invalid? — Philipp Sander
– Philipp Sander, Commented Aug 21, 2013 at 17:57
This has been so beat to death. Please, PLEASE, search before asking questions. — coreyward
– coreyward, Commented Aug 21, 2013 at 18:00

Chinmay235 · Accepted Answer · 2014-08-27 04:13:32Z

8

Try this

function is_valid_url(url)
{
     return url.match(/^(ht|f)tps?:\/\/[a-z0-9-\.]+\.[a-z]{2,4}\/?([^\s<>\#%"\,\{\}\\|\\\^\[\]`]+)?$/);
}

Call the is_valid_url(YOUR_WEBSITE_URL) function everywhere which you want to website validate.

edited Aug 27, 2014 at 4:13

answered Aug 21, 2013 at 18:26

Chinmay235

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3 Comments

Chinmay235 Over a year ago

Ok i am checking it now

Kyle Anderson Over a year ago

{2,4} does not cover a large number of TLDs especially all the new ones that just came out. See data.iana.org/TLD/tlds-alpha-by-domain.txt using {2,22} would cover most.

Diego Favero Over a year ago

it does validates \ and ˆ !

Govinda Yadav · Accepted Answer · 2014-09-19 10:58:38Z

2

Try This ..

<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<script src="http://jqueryvalidation.org/files/dist/jquery.validate.min.js"></script>
<script src="http://jqueryvalidation.org/files/dist/additional-methods.min.js"></script>
<script>
// just for the demos, avoids form submit
jQuery.validator.setDefaults({
  debug: true,
  success: "valid"
});
$( "#myform" ).validate({
  rules: {
    field: {
      required: true,
      url: true
    }
  }
});
</script>

answered Sep 19, 2014 at 10:58

Govinda Yadav

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Comments

Harold Castillo · Accepted Answer · 2018-02-27 06:44:32Z

0

I built this regex IP and DNS validation for javascript.

/^(http:\/\/www\.|https:\/\/www\.|http:\/\/|https:\/\/)?((([a-z0-9])*[:]){1}|(([a-z0-9])*[.]){1}|(([0-9]){1,3}([.]|[:])){3}(([0-9]){1,3}[:]){1})([a-z]{2,5}|[0-9]{1,5})([.]([a-z0-9]){1,3})?(\/.*)?$/

answered Feb 27, 2018 at 6:44

Harold Castillo

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